Corner-clamp.



A. H. STETSON.

CORNER CLAMP.

APPLICATION FILED AUG. 19, 1909.

Patented Feb. 15, 1910.

INVENTOR QM 94% y fl w 0%; M ATTORNEYS.

WITNESSES. Cmfi 9).

arm FFiQ AMOS H. STETSON, OF BROOKLINE, MASSACHUSETTS.

CORNER-CLAMP.

Specification of Letters Patent.

Patented Feb. 15, 1910.

Application filed August 1 9, 1909. Serial No. 513,646.

To all whom it may concern:

Be it known that I, AMos H. S'rn'rson, a citizen of the United States, and resident of Brookline, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Corner-Clamps, of which the following is a specification.

My invention relates to corner clamps and more particularly to corner clamps for use in temporarily securing a miter or bevel joint while it is being permanently fastened.

As is well known, a miter joint presents a smooth and finished appearance and for this reason is commonly employed in carefully constructed wooden objects whereon a smooth polished or ornamented surface is desired. The common method of securing these joints is to cover the opposed faces with glue and clamp them firmly in position while some suitable fastening means, such as a corrugated nail, is driven into the top and bottom ofthe joint, thus permanently securing the parts. During this operation it is essential that the work be clamped very tightly so that the opposed faces of the joint shall not become displaced and this tight squeezing of the clamp not infrequently causes depressions in the wood or otherwise scars and defaces it, so that one of the principal objects in employing a miter jointa smooth unscarred surfacefails of its purpose.

It is the object of my invention to provide a clamp of the class described which may be tightly squeezed upon the work without scarring or otherwise injuriously defacing the wood.

Referring to the drawings illustrating an embodiment of my invention; Figure 1 is a side elevation of my improved clamp, and Fig. 2 is an end View of the same.

As illustrated in the drawings, my improved clamp consists of two jaws A, pivoted at one end and slotted at the other (Fig. 2). A bar B is pivoted at one end to one of said jaws and passes freely through the other. This bar is screw threaded for a considerable portion of its length and a thumb nut C and a set nut D are mounted on said screw threaded portion. Upon the inside of each of the jaws A and near the upper end thereof, there is provided a pad or cushion E having a beveled gripping face from which project the points of one or more spurs or pins H. These spurs or pins pass completely through the pad E and the jaws A, and their blunt ends rest against the head of an adjusting screw G made of suflicient size to accommodate the ends of all the spurs so that all can be adjusted simultaneously with relation to the gripping face of the pad. A clamping screw F serves firmly to secure the spurs and the adjusting screw to the jaw. The pad or cushion, E which is preferably made of leather or other comparatively firm but soft material, is secured upon the jaw A by the spurs H passing therethrough and by the adjusting screw G which extends through the jaw into the body of the pad.

In use, as soon as the glue has been applied to the face of the joint, the clamp with its arms extended is held against the work with the points of the spurs H upon the opposite gripping faces of the pads E, about equally distant from the outside corner of the joint. The thumb nut C is then turned forward forcing the jaws together so that the projecting points of the spurs H penetrate the wood and the gripping faces of the pads press tightly agalnst the work. The joint is thus firmly clamped in position by the gripping faces of the jaws as shown in dotted lines in Fig. 1, and the possibility of accidental slipping of the clamp is precluded by the penetration of the spurs into the work. To release the clamp, the thumb nut C is backed against the set nut D. The jaws are then drawn apart thus withdrawing the spurs from the work and leaving the jaws extended in operative position to be applied to another joint. The spread of the jaws is controlled by the position of the set nut D which limits the outward movement of the thumb nut C, thus permitting the spread of the jaws to be adjusted to the angle of the joint.

It will be clear that in the use of my clamp the gripping faces of the pads prevent any defacement of the wood by the tight squeezing of the clamp, and that as the spurs project but a short distance from the faces of the pads and are withdrawn from the work at the same angle at which they enter, the application of the clamp results merely in minute, scarcely perceptible holes of the same diameter as the spurs which in no wise injuriously deface the surface of the wood, and are readily obliterated by the usual finishing processes.

What I claim is:

1. A corner clamp comprising relatively movable jaws, cushions on said jaws and spurs projecting from said cushions.

2. A corner clamp comprising relatively movable jaws, cushions on said jaws and spurs rigidly secured to said jaws and projecting from said cushions.

3. A corner clamp comprising a pair of jaws each provided with a cushion and an adjusting screw having an abutment, and spurs having their points projecting from the faces of said cushions and their blunt ends in engagement with said abutments whereby said spurs may be simultaneously adjusted with relation to the faces of said cushions.

4. A corner clamp comprising a pair of jaws each provided with a cushion, an adjusting screw, and spurs having their points projecting from the faces of said cushions and their blunt ends in engagement with said adjusting screws whereby said spurs may be simultaneously adjusted with relation to the faces of said cushions.

5. A corner clamp comprising a pair of jaws pivoted at one end, and each provided at its other end with a cushion and a plurality of spurs rigidly secured to said jaw and projecting from said cushion, and a bar pivoted to one and passing through the other of said jaws and provided with a nut whereby said jaws may be adjusted relative to each other and retained in adjusted position, and

"a set nut to limit the movement of said first an de of the work.

igned by me at Boston, Massachusetts this 13th day of August 1909.

AMOS H. STETSON.

\Vitnesses: V p,

CHARLES D. WOODBERRY, JOSEPHINE I-I. RYAN. 

